Examples of org.geotools.styling.ContrastEnhancement

org.geotools.styling.ContrastEnhancement
The ContrastEnhancement object defines contrast enhancement for a channel of a false-color image or for a color image. Its format is:
```
 <xs:element name="ContrastEnhancement"> <xs:complexType> <xs:sequence> <xs:choice minOccurs="0"> <xs:element ref="sld:Normalize"/> <xs:element ref="sld:Histogram"/> </xs:choice> <xs:element ref="sld:GammaValue" minOccurs="0"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="Normalize"> <xs:complexType/> </xs:element> <xs:element name="Histogram"> <xs:complexType/> </xs:element> <xs:element name="GammaValue" type="xs:double"/> 
```
In the case of a color image, the relative grayscale brightness of a pixel color is used. ?Normalize? means to stretch the contrast so that the dimmest color is stretched to black and the brightest color is stretched to white, with all colors in between stretched out linearly. ?Histogram? means to stretch the contrast based on a histogram of how many colors are at each brightness level on input, with the goal of producing equal number of pixels in the image at each brightness level on output. This has the effect of revealing many subtle ground features. A ?GammaValue? tells how much to brighten (value greater than 1.0) or dim (value less than 1.0) an image. The default GammaValue is 1.0 (no change). If none of Normalize, Histogram, or GammaValue are selected in a ContrastEnhancement, then no enhancement is performed. @author iant @source $URL$

    // /////////////////////////////////////////////////////////////////////
    //
    // CONTRAST ENHANCEMENT
    //
    // /////////////////////////////////////////////////////////////////////
    final ContrastEnhancement ce = rs.getContrastEnhancement();
    ceNode.addSource(cmNode);
    cmNode.addSink(ceNode);
    ceNode.visit(ce);

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     * @param band the image band to use for the greyscale display
     *
     * @return a new Style instance to render the image in greyscale
     */
    private Style createGreyscaleStyle(int band) {
        ContrastEnhancement ce = sf.contrastEnhancement(ff.literal(1.0), ContrastMethod.NORMALIZE);
        SelectedChannelType sct = sf.createSelectedChannelType(String.valueOf(band), ce);


        RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
        ChannelSelection sel = sf.channelSelection(sct);
        sym.setChannelSelection(sel);

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            channelNum[GREEN] = 2;
            channelNum[BLUE] = 3;
        }
        // Now we create a RasterSymbolizer using the selected channels
        SelectedChannelType[] sct = new SelectedChannelType[cov.getNumSampleDimensions()];
        ContrastEnhancement ce = sf.contrastEnhancement(ff.literal(1.0), ContrastMethod.NORMALIZE);
        for (int i = 0; i < 3; i++) {
            sct[i] = sf.createSelectedChannelType(String.valueOf(channelNum[i]), ce);
        }
        RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
        ChannelSelection sel = sf.channelSelection(sct[RED], sct[GREEN], sct[BLUE]);

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    public ContrastEnhancement build() {
        if (unset) {
            return null;
        }
        ContrastEnhancement contrastEnhancement = sf.contrastEnhancement(gamma, method);
        return contrastEnhancement;
    }

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    }
    
    protected ContrastEnhancement copy(ContrastEnhancement contrast) {
        if( contrast == null ) return null;
        
        ContrastEnhancement copy = sf.createContrastEnhancement();
        copy.setGammaValue( copy( contrast.getGammaValue()));
        copy.setMethod(contrast.getMethod());
        if(contrast.getType() != null) {
            copy.setType(contrast.getType());
        }
        return copy;
    }

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    }
    
    protected SelectedChannelType copy(SelectedChannelType selectedChannelType) {
        if( selectedChannelType == null ) return null;
        
        ContrastEnhancement enhancement = copy( selectedChannelType.getContrastEnhancement() );
        String name = selectedChannelType.getChannelName();
        SelectedChannelType copy = sf.createSelectedChannelType( name, enhancement);
        
        return copy;
    }

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        }
        pages.push(copy);
    }
    
    public void visit(ContrastEnhancement contrastEnhancement) {
        final ContrastEnhancement copy = sf.createContrastEnhancement();
        copy.setType(contrastEnhancement.getType());
        copy.setGammaValue(contrastEnhancement.getGammaValue());
        if (STRICT && !copy.equals(contrastEnhancement)) {
            throw new IllegalStateException("Was unable to duplicate provided contrastEnhancement:" + contrastEnhancement);
        }
        pages.push(copy);


    }

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        assertTrue("Equal objects should return equal hashcodes",controlEqHash == testHash);
    }
    
    public void testContrastEnhancementDuplication() throws Exception {


        ContrastEnhancement ce = sf.createContrastEnhancement();
        ce.setGammaValue(sb.literalExpression(0.5));
        ce.setMethod(ContrastMethod.HISTOGRAM);
        ce.setHistogram();
        ce.accept(visitor);
        ContrastEnhancement ce2 = (ContrastEnhancement) visitor.getCopy();


        assertEquals("Gamma value incorrest after duplication", ((Literal)ce.getGammaValue()).getValue(), ((Literal)ce2.getGammaValue()).getValue());
        assertEquals("ContrastMethod must be equal after duplication ", ce.getMethod(), ce2.getMethod());
        assertEquals("Contrast Type must be equal after duplication ", ((Literal)ce.getType()).getValue(),  ((Literal)ce2.getType()).getValue());


    }

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     *
     * @generated modifiable
     */
    public Object parse(ElementInstance instance, Node node, Object value)
        throws Exception {
        ContrastEnhancement ce = styleFactory.createContrastEnhancement();


        if (node.getChildValue("GammaValue") != null) {
            Double gamma = (Double) node.getChildValue("GammaValue");
            ce.setGammaValue(filterFactory.literal(gamma.doubleValue()));
        }


        if (node.getChild("Normalize") != null) {
            ce.setNormalize();
        } else {
            if (node.getChild("Histogram") != null) {
                ce.setHistogram();
            }
        }


        return ce;
    }

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    }


    public void testHistogram() throws Exception {
        SLDMockData.contrastEnhancement(document, document);


        ContrastEnhancement ce = (ContrastEnhancement) parse();
        assertNotNull(ce);


        assertNotNull(ce.getGammaValue());
        assertEquals(1.23, Filters.asDouble(ce.getGammaValue()), 0d);


        assertNotNull(ce.getType());
        assertEquals("Histogram", Filters.asString(ce.getType()));
    }

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